Two-needle hemstitch sewing-machine.



No. 737,012. PATENTED AUG. 25. 190s.

A. J. A. @ASHRAE-10H.

TWO NEEDLE HEMSTITGH SEWING MACHINE. APPLIOATION Plum MAR` zal 1902.

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PATENTED AUG. 25, 1903.

A. J. A. OESVTEREEIGE. Two .NEEDLE EEMSTITGH SEWING MACHINE.

APPLIUATION FILED MAR. 29, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

No. "rancia,

UNITED STATES Patented August 25, 1903.

PATENT OEEICE.

AMANDUS JOHANN AUGUST OESTERREICH, CF HAMBURG, GERMANY, ASSIGNOR TOTI-IEJSINGER MANUFACTURING COMPANY, OF ELIZA BETH, NEW JERSEY.

TWO-NEEDLE HEMSTITCH SEWING-MACHINE.

SPECIFICATION forming partof Letters Patent No. 737,012, dated August25, 1903.

i Application filed March 29,1902. Serial No. 100,500. (No model.)

To al wiz/0m it may concern/.j

Be it known that I, AMANDUS JOHANN AU- eusr OEsrERRnIor-I, a subjectofthe German Emperor, and a resident of Hamburg, in the German Empire,have invented certain new and useful Improvements in Two NeedleHemstitch Sewing Machines, of which the following is a specification.

In making asimplehemstitch either a oneneedle or a two needle hemstitchsewingmachine is employed and the vertically-reciprocating needle orneedles are moved laterally or horizontally to make the properhemstitch-gures. Vith a one-needle sewingmachine the two tying-seamsalong the two edges of the hem can, of course, only be made one afterthe other., whereas with a two-needle sewing machine both tying-seamsare made simultaneously, thus doubling the production.

The present invention relates to certain improvements in that class oftwo needle hemstitch-machines in the operation of which two hemstitch ortying seams are simultaneously formed; and the invention has for itsobject to provide a two-needle hemstitch-machine of such constructionthat it is adapted for wider hemstitching than the two-needlehemstitch-machines heretofore in use.

In the accompanying drawings, Figure 1 is a bottom view of a machineembodying the invention. Figs. 2 and 4 are opposite side ele- Vations ofthe same, partly in vertical section. Fig. 3 is a top view of themachine; Fig. 5, a partial cross-section of the same near the forwardend of the work-plate. Fig. 6 is a detail view of the thread-divider,andFig. 7 is a diagrammatic view illustrative of the formation andstitching `of the hem.

Referring to the drawings, 1 denotes the needle-bar, provided at itslower end with a cross-head 2, on which arepivotally mountedneedle-carriers 3, to which the needles Ilare secured, the saidneedle-carriers having a pinand-slot connection with each other and oneof them being provided with the upwardlyextending arm 7, to whichvibrating move ments are imparted, so as to move the needles toward andfrom each other horizontally, as denoted by the full and dotted lines inFig. 2. The arm 7 is vibrated back and forth by the U-shaped lever 5,(see Fig. 3,) fulcrumed in the head of the machine and having adepending arm loosely connected with said arm 7. To the lever 5 isjointed at its forward end a pitman 6, adjustably connected at its rearend to one arm of a bellcrank` lever 9, fulcrumed on a pin 8, and theother arm of said bell-crank lever is provided with a pin or studentering a camgroove in a cam-cylinder 10, which is geared to theneedle-bar-operating shaft in the usual manner.

Cooperating with the vertically and. horizontally reciprocating needles.tare suitable shuttles or loop-takers, mounted in laterallymovableraces or boxes 11, so as to be moved alternately to and fro coincidentlywith the to-and-fro lateral movements of the needles. To this end aconnecting-rod 12 is jointed at its forward end to the pitman 6, fromwhich the needles receive their lateral movements, and said rod12 isjointed at its rear end to the upper arm of a bell-crank lever 13, thelower arm of which is joined by' a pitman 14- to a crank-arm V15, withwhich is connected a two-armed rocking lever 16. The lower arm of thelever 16 is joined by a connecting-rod 17 with one of the shuttle-racesor loop-taker boxes 11, and the other arm of said lever is joined inasimilar manner by a connecting rod 18 to the other of the saidshuttle-races or loop-taker boxes 11, so that the loop-takers in saidboxes will be moved to and fro later- Vally in unison with thelaterallymoving needies.

The loop-.taking devices which I prefer to employ in the present machine'are oscillating shuttles of a well-known Singer type, and said shuttlesare operated from a rockshaft 19, to which oscillating movements areimparted in a Well-known manner from a rocker 22, receiving itsmovements in the usual manner from the rotating needle-baroperatingshaft mounted in the upper part of the bracket-arm of the machine.

Between the shuttle-races or loop-taker boxes 11 is mounted a relativelybroad threaddivider 23, attached to a carrier 24, secured to avertically-reciprocating block 25,` pro ICO vided with a'pin 26,embraced by the fork at the forward end 27 of a lever 28, fulcrumed onthe screw29 and connected at its rear end by a pitman 30 with acrank-arm 3l, attached to a rock-shaft 32, provided with an arm 33,arranged to be engaged at times by a pin 3l on the cam-cylinder l0 whenthe said threaddivider is to be moved downward at the intervals when thework is to be fed, the upward movements of the said thread-divider beingimparted thereto from the spring 37, connected to the arm 3l and to astationary part of the machine.

The feeding mechanism of the present machine is or may be of awell-known hemstitch type and in whichonly one forward feeding movementof the work will occur to three vertical reciprocations of the needles.The feed-dog of the present machine and part of its operating mechanismhave been omitted from the drawings for clearness of illustration; butthe said feed-dog may be operated in the usual manner throughrock-shafts beneath the work-plate, the rock-shaft 36, operated by therod 35, connected with the lever 33, serving to impart verticalmovements to the said feed-dog and a second rockshaft, operated by a rod2l, connected with the lever 20, serving to impart feeding movements tosaid feed-dog.

The operation of the machine is as follows: When the machine is stopped,the thread-divider 23, which is arranged between the needles 4:, shouldbe below the work, and the needles, which are reciprocated vertically inthe usual manner from the rotating needle-bar shaft, should be in theirraised positions. The work being placed beneath the presserfoot (notshown) and the machine being started, the thread-divider is first pushedup' ward between the threads of the fabric from below, and the needlesin their first descent willbe intheinner positions, (denoted by dottedlines in Fig. 2,) so as to pass downward in the needle-grooves (shown inFig. 6) at the edges of the broad thread-divider. During their seconddescent the needles will occupy the outer positions (denoted by fulllines in Fig. 2) and the loop-takers, following the lateral movements ofthe needles, will be correspondingly moved outward by the mechanismhereinbefore described and which is connected with the mechanism whichmoves the needles horizontally orlaterally. At their third descent theneedles will occupy the inner positions, (denoted by dotted lines inFig. 2,) these three descents of the needles completing thehemstitch-figure, and after this has been completed the thread-dividerwill be lowered and the work will. be fed forward for the nexthemstitch-figure.

The formation of the hemstitch-seams is diagrammatically illustrated byFig. 7, at one side of which are lettered the three stitches d b c ofthe zigzag hemstitch-gure, and a b o represent another zigzaghemstitchfigure, these :figures being joined by tying a stitch .c a' andthe last figure being joined to the next succeeding hemstitch-figure bya tyingstitch c a2.

With many hemstitch-machines now in use and in which the loop-takingdevices are not moved laterally withV the needles only comparativelynarrow hemstitch seams can be formed, for the reason that if lateralmovements of greater extent be imparted to the needles the latter willbe so much out of time from the loop-taking devices that the looptakerswill be liable to miss the needle-loops, and thus imperfect Work willresult; but in the present improved machine, in which the loop-takingdevices are moved laterally with the needles, very wide hemstitch-seamsmay be formed, as no such danger of skipping stitches will arise.

The present invention contemplates forming hemstitch-seams of differentwidths by providing interchangeable thread-dividers of different widthsand by mounting the needles to correspond. Also the extent of the depthstitches of the zigzag hemstitch-seams at the opposite sides of theopen-work seams may be varied by varying the point of connection of therear end of the pitman 6 with the lever 9, which is slotted for suchadjustment, and such adjustment will likewise in the present improvedmachine vary the lateral movements of the shuttle-race or loop-takerboxes 11, which are operated to move toward and from each other from thesame part (the lever 9) from which the needles receive their lateralmovements, so that one adjustment will provide for a variation of thelateral movements of the needles and of the looptaking devicescooperating therewith.

The invention is not to be understood as being limited to the details ofconstruction or to the particular form of sewing-machine herein shownand described, but may be varied widely without departing from thespirit thereof.

Having thus described my invention, I claim and desire to secure byLetters Patentn,

l. In a hemstitch sewing-machine, a stitchforming mechanism comprisingtwo needles and mechanism for imparting lateral to-andfro movementsthereto, of a thread-divider located between the vertical paths of saidneedles, two loop-taking devices coperating with said needles, andmeans, operated from the mechanism which imparts lateral movements tothe needles, forimparting toand-fro lateral movements, corresponding tothe lateral` movements of the said needles, to the said loop-takingdevices, and adjusting means whereby the lateral throws of the needlesand of the loop-taking devices may be sim ul-taneousl y varied.

2. In ahemstitch sewing-machine, the combination with two needles andtwo coperating loop-taking devices, of operating mechanism therefor,comprising means for moving said needles and loop-taking devices to- IIOIZO

Ward and from each other laterally, and a needles descend for the firststitch of a hemthread-divider located below the Work-plate of themachine between said loop-taking devices and also between the Vertical`paths of said needles, and mechanism for reciprocating saidthread-divider vertically, said operating mechanism being constructedand timed to lift said thread-divider before the stitch-figure and tohold the same in a raised 1o position during the formation of thestitches of a hemstitoh-gure.

AMANDUS JOHANN AUGUST OESTERREICII. Witnesses:

E. H. L. MUMMENHOFF, T. CHRIST. HAFERMANN.

